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1993年通过重病区的系统调查和流行因素定量测定,明确灰飞虱是小麦丛矮病最主要的介体,占飞虱种群的95％以上。灰飞虱在呼盟地区1年发生3代,在麦茬、草根、土缝内越冬,老熟带毒若虫和成虫是次年主要的初侵染源,其数量和带毒率与小麦丛矮病发病率之间具有线性关系,回归分析求得如下关系式:Y=0.1823X_1-5.7418X_2-0.03099X_3+1.1404X_4。病情与小麦受侵染时期密切相关,田间试验证明,三叶期以前感染小麦丛矮病发病最重,病情指数可达20％～30％。
In 1993 through the systematic investigation of endemic to ward and quantitative determination of epidemic factors, it was clear that Laodelphax striatellus was the main mediator of wheat clumpy dwarfism, accounting for more than 95% of the population of planthopper. Laodelphax striatellus occurred three generations a year in Humen area, overwintering in wheat stubble, grass roots and soil seams, and the mature nymphs and adults were the main source of primary infection in the next year. The numbers and virulence rates of Laodelphax striatellus The incidence of disease has a linear relationship between regression analysis obtained the following relationship: Y = 0.1823X_1-5.7418X_2-0.03099X_3 + 1.1404X_4. The condition was closely related to the period of wheat infection. Field experiments showed that the incidence of wheat dwarf disease was heaviest before the three-leaf stage, and the disease index could reach 20% -30%.